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Rapid Responses Against Invasive Species on Islands: Lessons from the Introduced Barbary Ground Squirrel Atlantoxerus Getulus in the Canary Islands

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Rapid Responses Against Invasive Species on Islands: Lessons from the Introduced Barbary Ground Squirrel Atlantoxerus Getulus in the Canary Islands Rapid responses against invasive species on islands: lessons from the introduced Barbary ground squirrel Atlantoxerus getulus in the Canary Islands F ÉLIX M. MEDINA,MARTA L ÓPEZ-DARIAS and J ULIEN C. PIQUET Abstract Despite efforts to combat invasive species, further increasing (Martín Esquivel et al., ) and the control of measures are still required to prevent their arrival and some of them entails severe financial costs (e.g. Lampropeltis translocation, especially into biodiverse island ecosystems. californiae; Gesplan, ). The archipelago lacks effective Although many governments worldwide have already estab- control, rapid warning procedures for invasive species, or lished protocols to control alien species, the European a legal framework to control movement of invasive species outermost regions have yet to implement fully effective between islands. prevention or rapid response procedures. The numerous The invasive Barbary ground squirrel Atlantoxerus translocations of the invasive Barbary ground squirrel getulus, which is native to Morocco and Algeria, illustrates Atlantoxerus getulus within the Canary Islands illustrate the situation. A pair of squirrels were taken to Fuerteventura this problem. From to at least . individuals in as pets, and by the s the species had colonized per year have been moved from Fuerteventura to other is- most of the island (López-Darias, ). In Spain the species lands. If movements of these medium-sized vertebrates are is now legally considered an invasive species. Its possession, taking place regularly, the number of smaller species trans- commerce and transportation are banned, although it is still ported within the archipelago could potentially be greater. deliberately moved between islands. Here we review avail- We argue that it is essential to implement stricter strategies able data (from the scientific and grey literature, and per- for invasive species control in these remote biodiversity-rich sonal communications with reliable sources) on known islands, including early detection and rapid response, to translocations of the Barbary ground squirrel in the minimize impacts on native biodiversity. Canary Islands, illustrating the lack of mechanisms pre- venting movement of invasive species within a European Keywords Alien species, Atlantoxerus getulus, Canary archipelago. islands, prevention, rapid response, squirrels From to there were at least confirmed trans- locations (involving at least individuals; Table , Fig. )of Many governments have established guiding principles Barbary ground squirrels between islands. An additional for the best cost-effective approach to counter problems seven sightings, two in , were not confirmed by knowl- posed by invasive species, and some countries have already edgeable individuals. There was no clear temporal pattern of developed rapid response strategies and early warning de- translocations (Fig. ), although they occurred in three per- – – – tection programmes (FICMNEW, ; DEFRA, ; iods: , and . Most of the Genovesi et al., ). For the outermost territories of translocations ( . %) were to Gran Canaria, probably Europe, European Regulation No. / on preventing because of its close commercial and touristic links with and managing invasive alien species, establishes that the Fuerteventura. Gran Canaria is a transit nexus for most of ’ implementation of programmes is the responsibility of the archipelago s commercial routes, and well connected Member states. The regulation specifies that the require- (especially by sea) with Fuerteventura and Lanzarote. In ments to control invasive species should be more restrictive addition, Gran Canaria is the most populated island and in the outermost territories, and preventive measures or Fuerteventura is the main touristic island of the eastern rapid response procedures should be adapted to the specific Canaries, which increases the probability of squirrel translo- features of the territories. However, the regulation is only cations from Fuerteventura. Only a small number of trans- being partly enforced in many of these outermost territories. locations have been detected to Lanzarote, even though it In the Canary Islands the number of invasive species is is the closest island to Fuerteventura ( km distant). Lanzarote’s human population is six times less than that of Gran Canaria and, even though it is well connected to FÉLIX M. MEDINA (Corresponding author) Servicio de Medio Ambiente, Cabildo Fuerteventura by sea, the ports are mainly resorts, with de La Palma, Avenida Los Indianos 20, 38700 Santa Cruz de La Palma, Canary few resident islanders, and thus the likelihood of transloca- Islands, Spain. E-mail [email protected] tions is lower. MARTA LÓPEZ-DARIAS and JULIEN C. PIQUET Island Ecology and Evolution Considering the strict controls in place at airports, it is Research Group, Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Tenerife, Canary Islands, Spain most likely that squirrels are moved by sea. As the keeping Received October . Revision requested January . of squirrels is illegal, it is unlikely that escapes will be re- Accepted January . First published online May . ported by owners to the relevant authorities. On only one Oryx, 2019, 53(4), 782–786 © 2018 Fauna & Flora International doi:10.1017/S0030605318000200 Downloaded from https://www.cambridge.org/core. IP address: 170.106.202.8, on 01 Oct 2021 at 23:53:25, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S0030605318000200 https://www.cambridge.org/core/terms Downloaded from Oryx , 2019, 53(4), 782 TABLE 1 All known confirmed and unconfirmed translocations of the Barbary ground squirrel Atlantoxerus getulus from Fuerteventura to elsewhere in the Canary Islands (see ID numbers in https://www.cambridge.org/core Fig. ) during –, with date of detection or capture if known. Date of Year of detection/ No. of Other – 786 ID introduction capture Location Island individuals information Source © Confirmed translocations . https://doi.org/10.1017/S0030605318000200 2018 Fauna & Flora International doi:10.1017/S0030605318000200 1 1996 La Isleta Gran Canaria 1 Euthanized Calabuig (1999) 2 1997 San Fernando de Maspalomas Gran Canaria 1 Euthanized Calabuig (1999) . IPaddress: 3 1997 Lomo Blanco, Las Palmas de Gran Canaria 1 Euthanized Calabuig (1999) Gran Canaria 4 1997 Telde Gran Canaria 2 Euthanized Calabuig (1999) 5 1997 Cuatro Puertas, Telde Gran Canaria 1 Euthanized Calabuig (1999) 170.106.202.8 6 1997 Las Palmas de Gran Canaria Gran Canaria 1 Euthanized Calabuig (1999) 7 1997 Monte Lentiscal, Tafira Gran Canaria 2 Euthanized Calabuig (1999) 8 1998 Barranco de Guayadeque Gran Canaria 5 Shot or trapped Calabuig (1999) , on 9 1998 9 Aug. 1998 La Lechuza, Vega de San Mateo Gran Canaria 1 Castrated & kept in Calabuig (1999) 01 Oct2021 at23:53:25 captivity in CRFS Tafira 10 1998 30 Aug. 1998 Cortijo de Pajonales Gran Canaria 1 Shot Calabuig (1999) 11 2006 8 Nov. 2006 El Cable, Arrecife Lanzarote 1 Trapped Authors’ data 12 2006 13 Nov. 2006 El Cable, Arrecife Lanzarote 1 Trapped Authors’ data 13 2007 1 Feb. 2007 Unspecified Gran Canaria 1 Trapped Fundación Neotrópico, , subjectto theCambridgeCore termsofuse,available at pers. comm. 14 2007 30 Aug. 2007 Unspecified Gran Canaria 1 Trapped Fundación Neotrópico, pers. comm. 15 2007 5 Nov. 2007 Unspecified Gran Canaria 2 Trapped Fundación Neotrópico, pers. comm. 16 2009 17 Apr. 2009 Batería de San Juan, Las Palmas Gran Canaria 1 Trapped Fundación Neotrópico, de Gran Canaria pers. comm. 17 2014 Muelle de Santa Cruz de Tenerife Tenerife 1 Confiscated because il- Fundación Neotrópico, legally transported pers. comm. 18 2014 La Lomada Grande, Garafía La Palma 1 Euthanized Authors’ data 19 2015 2 Aug. 2015 Punta Gaviota, Vecindario Gran Canaria 1 Photographed but Social network never trapped or later announcement Invasive species on islands 783 seen 20 2015 5 Oct. 2015 El Burrero, Ingenio Gran Canaria 1 Photographed but Social network never trapped or later announcement seen 21 2016 1 Sep. 2016 Punta de Gando, Telde Gran Canaria 1 Trapped & euthanized Authors’ data 22 2016 15 Nov. 2016 Juncalillo del Sur, San Bartolomé Gran Canaria 1 Found as remains A. Padrón, unpubl. de Tirajana data 23 2016 Santa Cruz de Tenerife Tenerife 1 Trapped Fundación Neotrópico, pers. comm. 784 F. M. Medina et al. comm. data & B. Fariña, pers. comm. comm. Source FIG. 1 The Canary Islands, showing the locations of all confirmed translocations of Barbary ground squirrels Atlantoxerus getulus during –. Numbers correspond to the ID in Table . White numbers represent the total number of Other information squirrels translocated to each island. occasion (ID , Table ) was a squirrel confiscated at a port, which demonstrates the laxity of control measures. As all the islands in the archipelago are climatically suitable for individuals the Barbary ground squirrel (López-Darias et al., ), the invasion of other islands is only a matter of time unless effective procedures are applied. When a squirrel is reported on islands other than Fuerteventura the relevant government body has to take ac- tions that require both financial and human resources not specifically intended for the purpose. As there is no coordi- nated response protocol, each public administration tackles each detected translocation independently. In La Palma insular government captured an introduced squirrel shortly after its initial sighting, requiring
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